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Factorial is not really a real function (see later), but it is so important that we include it here among useful functions.

Definition. Let k be a positive integer. We define the factorial of k as

k !=1·2·3·...·( k -1)· k .

We also define 0!=1.

Examples: 2!=1·2=2, 5!=1·2·3·4·5=120, 7!=5040.

Factorial grows very quickly, for instance 10!=3,628,800 and 20! is a number with 19 digits. 100! is so large that most calculators refuse o calculate it (usually the best they can do is 69!, which is about 1.7·10 98 ).

An important property of factorials is that they readily cancel in fractions. For instance:

Similarly

The down side is that there are no nice algebraic properties, for instance there are no nice formulas for things like (2 k )!, k k ! etc.

Such expressions cause mistakes when factoring, here is one correct example:

Nothing more can be done with it.

There is a thing called double factorial , where instead of multiplying all numbers one takes just every second.

Definition. Let k be a positive integer. We define k !! as k !!=1·3·5·...·( k -2)· k for k odd, k !!=2·4·6·...·( k -2)· k for k even.

Examples: 7!!=1·3·5·7=105, 10!!=2·4·6·8·10=3840. As usual, 0!!=1.

Factorial is a function whose domain is natural numbers and zero. Is it possible to extent this definition to a larger set (like to all non-negative real numbers) by somehow connecting the dots in the graph? This would be very helpful, for instance it would allow us to use the l'Hospital rule when calculating limits with factorials. The good new is that the answer is yes, there is a function defined on all real numbers apart from negative integers which agrees with factorial at natural numbers, see FAAERD Christmas Red Raccoons Mens Breathable Mesh Air Cushion Sports Running Shoes Casual Walking Sneakers cheap sale cost discount get authentic Pc55PXNOV
. The bad news is that this function is not exactly easy to work with and in particular, the tricks for limits that we covered are much better in dealing with factorials than messing around with Gamma functions.

Binomial coefficients

Definition. Let n k be non-negative integers. We define

This is called the binomial coefficient , also binomial number , or combinatorial number . We read this expression " n choose k ".

Example:

Some identities:

The last identity is very interesting, since on the right there are no factorials on the top, that is, the variable n is free to change. Thus we can introduce a useful generalization.

Definition. Let x be a real number, k a natural number. We define the binomial number by

Examples:

"Saw-like" functions Back to Theory - Elementary functions

Dan Shaffer (Lancaster, PA / Juniata College ‘17)

Dan Shaffer grew up in Lancaster, Pennsylvania, and attended the Juniata College where he degrees in International Studies and German. Through Juniata, he studied abroad in Marburg, Germany where he studied Political Science. While at Juniata, Dan devoted much of his time to campus programming by serving as a Senior Resident Assistant, a Study Abroad Peer Advisor, Policy Chair for Juniata’s student government, and as the Content Coordinator for Juniata’s school newspaper, The New Juniatian . Dan is an Eagle Scout and recipient of the Eagles Abroad fellowship at Juniata College. In his free time, Dan likes learning and speaking foreign languages, playing computer games, writing/editing, listening to/creating music, hanging out with friends, and hiking. He is a part of the Northside cohort, and is serving with the Hill Community Development Corporation .

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(Pittsburgh, PA /
University of Pittsburgh ’17)

Noble Smith (Pittsburgh, PA / University of Pittsburgh ’17)

A graduate of University of Pittsburgh , Noble Smith received a Bachelor of Arts in Political Science while minoring in Sociology and receiving certificates in German and Portuguese. At Pitt, he served as Vice President of the Genocide Relief and Awareness Club, was a founding member of the Alpha Tau Omega Panhellenic Fraternity, and worked as a mailroom clerk. Additionally, Noble volunteered with Pitt Keep It Real , where he worked with Somali immigrants as a math and reading tutor, and with the Durham Food Pantry. Noble is proficient in Spanish, Portuguese, English and German! In his free time, he is passionate about rugby, political awareness, and community outreach.He is a part of the East End cohort, and is serving with East Liberty Development, Inc ..

Courtlen Vizzuso (Alliance, OH /Ohio University ’17)

Courtlen Vizzuso grew up in Alliance, OH and attended Ohio University where he earned a B.A in Political Science Pre-Law, while also earning a Law Justice Culture Certificate. At OU, he devoted much of his time to campus service. He served as a College Representative Orientation Leader with the Undergraduate Orientation Programs. He also a Learning Community Leader with Learning Community Programs where he mentored first-year political science students, assisted Learning Community class instructor with lesson plans, lead discussions, and programmed diversified events. In his free time, Courtlen enjoys singing, playing soccer, meeting new people, and trying new foods. He is a part of the Northside cohort, and is serving at United Way of Southwestern Pennsylvania .

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